I ran vdbench with compratio 3, dedupratio 3, and dedupunit 4k across a number of slaves (rdpct 0 seekpct eof). If I run dsim it reflects 1:0 dedup .
worker1:~# /opt/vdbench/current/vdbench dsim -u 4k /dev/sdb
20:17:34.352 Reads done: 141,312 (of xfersize 1048576)
20:17:34.352 Blocks_hashed: 18,087,936 (of dedupunit 8192)
20:17:34.352 Hash size: 18,087,936
20:17:34.352 Dedup sets: 0
20:17:34.352 Duplicate blocks: 0
20:17:34.352 Unique blocks: 18,087,936
20:17:34.352
20:17:34.353 Totals: Dedup ratio: 1.00:1 (1.00000) Files read: 1; Reads done: 141,312; mb/sec: 145.71
If I run csim it refects ~5.85:1 compression.
worker1:~# /opt/vdbench/current/vdbench csim /dev/sdb
22:04:30.549
22:04:32.926 /dev/sdb size: 138g samples: 1131 in: 141.4m out: 24.3m pct: 17.2 compratio: 5.83:1
I expected something close v to 3:1 on both. Am I running this incorrectly?